Viologen Derivatives Extended with Aromatic Rings Acting as Negative Electrode Materials for Use in Rechargeable Molecular Ion Batteries.,ChemSusChem

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Viologen Derivatives Extended with Aromatic Rings Acting as Negative Electrode Materials for Use in Rechargeable Molecular Ion Batteries.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-03-20 , DOI: 10.1002/cssc.201903541
Minami Kato ₁ , Hikaru Sano ₁ , Tetsu Kiyobayashi ₁ , Masaru Yao ₁

Affiliation

Many types of batteries have been proposed as next-generation energy-storage systems. One candidate is a rocking-chair-type "molecular ion battery" in which a molecular ion, instead of Li+ , works as a charge carrier. Previously, we reported a viologen-type derivative as a negative electrode material that releases and receives PF6 - anions during the charge-discharge process; however, its redox potential was not satisfactorily low. Further, the two potential plateaus of this material (difference=0.5 V) should be reduced. In this study, PF6 - salts of viologen (bipyridinium) derivatives extended by aromatic rings were synthesized to obtain a negative electrode material with a lower redox potential and small potential change during the charge and discharge processes. Some of the synthesized viologen derivatives were fluorescent even in solid-state electrodes. In the half-cell configuration, the prepared negative electrode materials showed average voltages of approximately 2 V (vs. Li+ /Li), which is lower than that of conventional viologen derivatives.

中文翻译：

带有芳香环的紫精衍生物用作可充电分子离子电池的负极材料。

已经提出了许多类型的电池作为下一代能量存储系统。一种候选者是摇椅型“分子离子电池”，其中分子离子代替Li +充当电荷载体。以前，我们报道了一种紫精型衍生物作为负极材料，该材料在充电和放电过程中会释放并接受PF6-阴离子。然而，其氧化还原电势并不令人满意。此外，应减小该材料的两个电位平台（差= 0.5 V）。在该研究中，合成了由芳香环延伸的紫罗兰（联吡啶鎓）衍生物的PF6-盐，得到的负极材料在充放电过程中氧化还原电位较低，电位变化较小。某些合成的紫精衍生物即使在固态电极中也具有荧光。在半电池构造中，所制备的负极材料显示出约2 V（vs. Li + / Li）的平均电压，低于常规的紫精衍生物的平均电压。

更新日期：2020-03-20

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